Abrasive instrument



V.March-12, 1946. H.KGRENzow A2,396,418

ABRAS IVE INSTRUMENT I Filed Oct. 9, 1945 Patented Mar. 12, 1946 UNITED STATES PATENT OFFICE ABRASIVE INSTRUMENT Harrison Grenzow, Juda, Wis.

Application October 9, 1945, Serial No. 621,212

2 Claims.

This invention relates to bases for holding abrasive, such as sand paper or emery cloth, and it is on object of this invention to produce a holder of the character indicated having plane surfaces and square corners which afford means by which surfaces can be treated or sand papered in angular portions of the floor or other surfaces being treated.

It is furthermore an object of the invention to provide an abrasive base having novel means by which the abrading material is anchored on the base or block in order that no attaching or fastening means are required that may interfere with the effective use of the device; it being the purpose of the inventor to provide the base or block with a kerf or slot, preferably diagonally disposed with relation to the axis of the base or block, so that the edges of the abrading material may be in.. serted in the kerf and, by reason of the stiffness of the abrading material, it will be retained against accidental displacement. The parallel portions of the abrading material which are lodged in the kerf have their contacting surfaces covered with the abrading material such as sand or emery and thus they do not slip with relation to each other and cannot be readily dislodged Without the application of force exerted between the abrading material and the base or block.

It is furthermore an object to provide a device of the character indicated which is inexpensive to produce and maintain and it is an article of manufacture and has proven eiective and satisfactory in use.

With the foreing and other objects in View, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawing forming part of this application, wherein like characters denote corresponding parts in the several views, and in which- Figure 1 illustrates a view in perspective of a holder and abrading material embodying the invention;

Figure 2 illustrates a sectional view on the line 2 2 of Fig. 1;

Figure 3 illustrates an end View of the body and one step of assembling the abrading material thereon; and

Figure 4 illustrates a similar view showing an advanced step of anchoring the abrading material. t

In the drawing, I denotes a base or body which 4 is preferably rectangular, although obviously it may be square, but it should have corners 2, 3, 4 and 5 having sharp angles to afford abrading surfaces which can be applied to the material being ,reated at the corners, or where there are angularly disposed walls at the surface to be treated so that no part of the surface being treated at the said corners is slighted or left untreated. The base or body is provided with a diagonally disposed kerf or slot (i, in which the abrading material is anchored, as will presently appear. 4

In applying the abrading material to the body, it is bent near its edges, as at '1, and then around the corners of the body, as shown at 8, 9 and l0, and the abrading material is anchored to the body by bending the said material at Il to correspond 4 to the corners 5 of the body and is then bent so that the portion I2 may be inserted in the kerf 6, as shown in Figure 3, in parallelism with that portion I3 ofthe abrading material which is bent at the location l, and inserted in the kerf. The abrading material may be readily dislodged by reversing the operation and a new abrading sheet may be inserted.

It is obvious from the foregoing description that the abrading instrument comprises comparatively few, inexpensive parts, effective for use on the four sides, a condition which results in the saving of the abrading material and the full capacity of the abrading material is utilized.

I claim:

1. An abrasive instrument comprising a base with square corners and a kerf extending diagonally with respect to the axis thereof in one of its faces, an abrading sheet encompassing the base and closely engaging the base at the said corners, the said abrading sheet having its edges in proximity at the location of the kerf and extending at acute angles to the surface of the base and lodged in the kerf.

2. An abrasive instrument comprising a base with square corners and a kerf extending diagonally with respect to the axis thereof in one of its faces, an abrading sheet encompassing the base and closely engaging the base at the said corners, the said abrading sheet having its edges in proximity at the location of the kerf and extending at acute angles to the surface of the base and lodged in the kerf, the said abrading sheet having the abrading surfaces in contact within the kerf.

HARRISON GRENZOW. 

